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A model for a redox species confined to a thin layer with a variable diffusion coefficient
Author(s) -
Cassidy John,
McCormac Timothy
Publication year - 1996
Publication title -
electroanalysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.574
H-Index - 128
eISSN - 1521-4109
pISSN - 1040-0397
DOI - 10.1002/elan.1140080208
Subject(s) - diffusion , diffusion layer , redox , effective diffusion coefficient , chemistry , layer (electronics) , analytical chemistry (journal) , thermodynamics , inorganic chemistry , chromatography , organic chemistry , physics , medicine , radiology , magnetic resonance imaging
A numerical simulation has been carried out for a redox couple confined to a thin layer under potential step or cyclic voltammetric conditions where the diffusion coefficient is determined by the relative amounts of the oxidized form (of diffusion coefficient D 1 )and reduced form (of diffusion coefficient D 2 ). An overall layer diffusion coefficient D is determined by the mole fractions of species 1 and 2; D ( n 1 + n 2 )= n 1 D 1 + n 2 D 2 . This layer diffusion coefficient is proposed as an alternative model to that of interaction parameters used to characterize nonidealities during potential step and cyclic voltammetric experiments of surface confined redox species.